Door-spring.



0. GNTHER.

Doon SPRING.

l APPLICATION FILED APB.24,1908. 920,323, Patented May 4, 1909.

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O. GNTHER.

DOOR SPRING.

APPLIOATION FILED APR.z4,1ooa.

920,323 Patented May 4, 1909.

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, Y MK: mmzm@ UNITED STATES OSKAR GNTHER, OF KELLOGG', IDAHO.

DOOR-SPRING.

Specification of Letters Patent.

Patented May 4, 1909.

Application filed April 24, 1908. Serial No. 429,088.

To all whom tt may concern.'

Be it known that I, OsjKAR GUN'rI-IER, a citizen of the United States ofAmerica, residing at Kellogg, and State of Idaho, have invented new anduseful Im rovements in Door-Springs, of which the following is aspecification.

This invention relates to door springs, and one of the principal objectsof the same is to provide a door spring for keeping a door closed whichwill be entirely out of sight and which Will operate smoothly andefficiently for its purpose.

Another object of the invention is to provide means for adjusting thetension of the spring whenever required.

These and other objects may be attained by means of the constructionillustrated in the accompanying drawing, in which,-

Figure 1 is a plan view illustrating the top of a door and the doorspring in dotted lines, while the door frame is shown in section. Fig. 2is a partial vertical section of the upper portion of the door frame,showing the s ring connected thereto and a fragment of t e door. Fig. 3is an enlarged vertical section of the lower end of the spring casingand showing a key inserted in the enlarged end of the spring rod and akey connected thereto for winding the spring. Fig. 4 is a similar view,showing the key removed and the slotted buffer plate secured to thespring rod. Fig. 5 is a horizontal section on the line 5 5 of Fig. 2,looking in the direction indicated by the arrows. Fig. 6 is a detailperspective view of parts of the door spring.

Referring to the drawing for a more specific description of myinvention, the numeral 1 designates the door casing, 2 is the doorhinged at 3 to said casing, and 4 is the top of the door casing.

Secured to the upper edge of the door in a.

suitable recess formed therein is a late 5 provided with a longitudinalslot 6 raving an enlarged aperture 7 at one end thereof, said platebeing set flush with the upper edge of the door in the recess 8. Securedinthe top of the door frame is a spring casing or tu e 9 in which'aspring rod 10 extends from end to end, said spring rod having anenlargement 11 at one end and a similar enlargement 12 at the other endthereof. A spiral spring 13 eneircles the rod 10, said spring beingsecured at 14 to the enlargement 12, while the opposite end of thespring is secured to the casing 9. The base plate in the county ofShoshone l 15 of the tube 9 is secured by screws 16 to the door frame 4,and said base plate is provided with a depression 17 (Fig. 3) in whichis seated the end of the sliding plate 18, said plate being bent nearits end to rest in the depression 17 in the base plate 15, as shown moreparticularly in Fig. 4.

A triangular keyhole is formed in the enlargement 12, and a key 10 maybe inserted in this keyhole for adjusting the tension of the spring 13.rlhe key is first assed through the hole in the plate 18, an( after thespring has been wound up the enlargement 12 is connected with the plate18, and thus the spring is prevented from unwinding. When the key hasbeen removed from the keyhole 20, a screw 21 connects the sliding plate18 with the spring casing and holds the spring 13 in tension, as shownmore particularly in Fig. Ll. The sliding plate 1S is provided withahead 22 which fits within the aperture 7 at the end of the slot 6.

The operation of my invention may be briefly described as follows: lVhenthe door 2 is wung open on its hinges 3 the spiral spring 13 is woundup, and the reaction of sai( spring under tension will close the door,the head 22 of the sliding plate 18 moving in the slot 6. The slidingplate 18 is slightly curved, as shown in Figs. 5 and 6.

From the foregoing it will be obvious that my door spring is sim le inconstruction, is practically out of sig it, means being provided forreadily adjusting the tension of the spring, and the entire device isinexpensive to manufacture.

Having thus described the invention, what is claimed as new, is td 1. Adoor spring comprising a casing adapted to be connected to the top of adoor frame and projectiiw vertically therefrom, a spring, a spring rodhaving enlarged ends secured in said casing, one of said ends having akeyhole therein to adjust the tension of the spring, a plate connectedto the spring rod, and a slotted plate secured to the door, the formerbeing connected to and adapted to slide upon the other.

2. A door spring comprising a casing seated in the upper portion of thedoor frame and projecting vertically therefrom, a spring within thecasing, a rod having enlarged ends to one of which one end of the springis connected, the other end being connected to the casing, a curvedplate having a head provided with a reduced portion, and a slotted plateseeuredto the dool'and provided withV l an enlarged aperture toaccommodate the head.

3. A door spring comprising a casing, a rod mounted in said casing, aspring connected at one end to said rod and having its other endconnected to said casing, a plate conneeti ed to the rod at one end andhaving ahead at its opposite end, a slotted plate secured to the 10 topof the door and provided with an en- 1 larged aperture therein, and acurved plate having a head tted in said enlarged aperture OSKAR GNTHER.

Witnesses Y F. J. SCHULTZE, E. J. HORNIBROOK.

